1.2-1.3GHz LNB 下变频器 降频器 L Band LNB

Description

1200–1300 MHz Low-Noise Block Downconverter LNB

Product Overview

Shenzhen Huashi Digital Technology Co., Ltd. presents an L-band (1.2–1.3 GHz) low-noise block downconverter (LNB) for reception and test/measurement applications. It integrates a low-noise amplifier (LNA) and downconverter to translate RF signals to an IF of 20–120 MHz, providing ≥45 dB​ conversion gain with 1 dB​ step, 30 dB​ range gain adjustability. Remote control is supported via RS232/RS422/RS485, and the RF ports are SMA-K (50 Ω). Compact and easy to integrate, it is suitable for ground station front ends, spectrum monitoring, weak-signal reception, and link gain shaping.

Key Specifications

Features

• High gain with low noise: maintains ≥45 dB​ conversion gain while keeping the noise figure as low as 2 dB, increasing weak-signal link margin.
• Fine gain control: 1 dB​ step, 30 dB​ range for system-level gain shaping and dynamic range optimization.
• Industrial-grade stability: 0.2 dB/10 minutes​ gain stability for long-term, continuous operation and stability‑sensitive applications.
• Wide input tolerance: accepts -38 ~ -68 dBm​ input range, compatible with various front-end attenuator/amplifier configurations.
• Strong drive capability: output P1dB ≥ +17 dBm​ to drive subsequent stages or long cable runs.
• Multi-interface remote management: RS232/RS422/RS485​ options for easy integration with network management, monitoring, and automated test systems.

Applications and Interface Notes

• Typical applications: L-band satellite/ground station front ends, remote weak-signal reception, spectrum monitoring and analysis, link budget optimization, and AGC/ALC preamplifier​ stages.
• Interface and power: RF ports are SMA-K (50 Ω); control via RS232/RS422/RS485​ using shielded twisted pair (STP) with proper grounding. Power supply and power consumption are specified on the equipment nameplate/communication protocol (remote gain adjustment and status readback require a host controller or PC).

Setup and Debugging Recommendations

• Gain setting: set the IF gain so the overall link operates in the linear region according to the receiver’s input range and the noise of subsequent stages; then fine-tune in 1 dB​ steps to balance C/N​ and distortion.
• Input level: keep the front-end signal within -38 ~ -68 dBm​ to avoid distortion or compression; add/remove attenuation as needed.
• Cabling and matching: use low-loss 50 Ω​ coaxial cables and keep them as short as possible; ensure connectors are fully tightened and weatherproofed to reduce reflections and insertion loss.
• Control and monitoring: use RS232/RS422/RS485​ to read device status and alarms; configure communication parameters (e.g., address, baud rate, parity) per the manual.